Contour feathers cover the body of the bird.
These feathers help air to pass over the bird in a streamlined shape, making the bird more aerodynamic.
The tips of contour feathers have smooth barbs at the tips, which are more waterproof than the softer barbs towards the body.
The Source:
Page #11
Ornithology #20
Feathers: The Anatomy
of a Feather #1
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